A structure for improving the heat preservation performance of a battery pack upper cover

Abstract

The utility model relates to battery pack heat preservation technical field, concretely is a kind of structure of improving the heat preservation performance of battery pack upper cover, including upper cover body, the inner surface of upper cover body is equipped with the honeycomb cavity of uniform distribution, the honeycomb cavity is filled with aerogel particles, the outside of honeycomb cavity is equipped with the heat insulation layer of integration with upper cover body, the heat insulation layer is inlaid with multiple heat-conducting fibre bundles;The outer surface of upper cover body is equipped with several micropore array, and the micropore array is filled with graphene coating.The utility model can significantly improve the heat preservation effect of battery pack under low temperature environment, simultaneously under high temperature condition, the excess heat generated by battery module is quickly exported, and heat accumulation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery pack insulation technology, specifically a structure for improving the insulation performance of a battery pack cover. Background Technology

[0002] With the rapid development of new energy vehicle technology, the battery pack, as one of the core components of electric vehicles, directly affects the vehicle's safety, range, and overall operating efficiency. Thermal insulation performance is a key technology in battery pack design, especially important in extreme environments. Good thermal insulation effectively maintains the stable operating temperature of the battery system, improves battery life and safety, and thus enhances the vehicle's adaptability to low or high temperature environments. Therefore, optimizing the thermal insulation structure of the battery pack cover has significant practical and technical value.

[0003] The patent with publication number CN118472486B proposes a battery pack structure that achieves efficient heat dissipation through an insulating cooling medium. This patent improves heat dissipation performance to cope with thermal runaway, but it does not address the optimization of heat preservation performance in low-temperature environments, nor does it specifically design the heat preservation structure of the shell material, especially the top cover. This may lead to the problem of excessive heat loss in low-temperature environments, affecting the temperature stability of the battery system.

[0004] Therefore, there is an urgent need to propose a structural design that can improve the thermal insulation performance of the battery pack cover to make up for the shortcomings of the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a structure that improves the heat insulation performance of the battery pack cover, which can significantly improve the heat insulation effect of the battery pack in low-temperature environments, and at the same time quickly dissipate the excess heat generated by the battery module under high-temperature conditions to avoid heat accumulation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a structure for improving the thermal insulation performance of a battery pack cover, comprising a cover body, wherein the inner surface of the cover body is provided with uniformly distributed honeycomb cavities, the honeycomb cavities are filled with aerogel particles, and the outer side of the honeycomb cavities is provided with a heat insulation layer integrally formed with the cover body, wherein the heat insulation layer is embedded with multiple thermally conductive fiber bundles; the outer surface of the cover body is provided with a plurality of micropore arrays, wherein the micropore arrays are filled with a graphene coating.

[0007] Preferably, the edge of the upper cover body is provided with a sealing groove, and an elastic sealing strip is embedded in the sealing groove.

[0008] Preferably, the depth of the honeycomb cavity is 30%-40% of the thickness of the upper cover body, and the spacing between adjacent cavities is 1.5 times the cavity diameter.

[0009] Preferably, one end of the thermally conductive fiber bundle extends to the inner surface of the upper cover body, and the other end penetrates the heat insulation layer and extends to the bottom of the microporous array. The outer surface of the thermally conductive fiber bundle is coated with a nano-scale alumina heat insulation coating.

[0010] Preferably, the pore size of the micropore array is 0.2-0.5 mm, the pore spacing is 2-3 times the pore size, and the thickness of the graphene coating is 80%-90% of the micropore depth.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. By setting a honeycomb cavity and filling it with aerogel particles in the RTM high composite material top cover body, combined with the microporous array and graphene coating on the outer surface, a multi-level thermal insulation system is formed, which can significantly reduce the heat transfer rate and thus effectively maintain the temperature stability inside the battery pack. 2. The design combines an integrated heat insulation layer with thermally conductive fiber bundles, which can not only block the intrusion of external heat, but also quickly dissipate the excess heat generated by the battery module, thus avoiding heat accumulation. 3. The installation of elastic sealing strips ensures sealing performance while providing excellent vibration resistance and installation adaptability. It effectively prevents external cold air or moisture from seeping in, further enhancing the insulation effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional layered structure diagram of the present invention. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figures 1 to 2This utility model provides a technical solution: a structure for improving the thermal insulation performance of a battery pack cover, comprising a cover body 1 made of RTM high-polymer composite material, with a thickness designed to be between 10mm and 20mm according to actual needs. The inner surface of the cover body 1 is provided with honeycomb-shaped cavities 2, which are evenly distributed across the entire inner surface. The depth of these cavities is 30% to 40% of the thickness of the cover body 1, approximately 3mm to 8mm, and the spacing between adjacent cavities is 1.5 times the cavity diameter. This design not only effectively reduces the overall weight of the cover body 1 but also allows for the filling of aerogel particles 3 within the cavities to enhance the thermal insulation effect. Aerogel particles 3 are a material with extremely low thermal conductivity; when filled into the honeycomb cavities 2, they significantly reduce the rate of heat transfer through the cover body 1, thereby achieving excellent thermal insulation performance. Furthermore, the design of the honeycomb cavities 2 also enhances the mechanical properties of the cover body 1, making it less prone to deformation or damage under external loads.

[0015] Furthermore, an integrally formed heat insulation layer 4 is provided on the outer side of the honeycomb cavity 2. The heat insulation layer 4 is made of high-temperature resistant heat insulation cotton material and is tightly bonded to the upper cover body 1. Its thickness is 2mm to 4mm. Multiple heat-conducting fiber bundles 5 are embedded in the heat insulation layer 4. One end of these heat-conducting fiber bundles 5 extends to the inner surface of the upper cover body 1, and the other end penetrates the heat insulation layer 4 and extends to the bottom of the microporous array 6. The function of the heat-conducting fiber bundles 5 is to quickly conduct excess heat generated inside the battery module and prevent heat accumulation that could lead to excessively high local temperatures. To further improve the heat insulation effect, the outer surface of the heat-conducting fiber bundles 5 is coated with a nano-level alumina heat insulation coating. This coating can effectively reduce heat diffusion outward along the fiber bundles, thus meeting the thermal management requirements under high-temperature conditions.

[0016] like Figure 2 As shown, the outer surface of the upper cover body 1 is provided with a plurality of micropore arrays 6. The pore diameter of these micropore arrays 6 is 0.2 mm to 0.5 mm, and the pore spacing is 2 to 3 times the pore diameter. For example, when the pore diameter is 0.3 mm, the pore spacing can be designed to be 0.6 mm to 0.9 mm. The micropore arrays 6 are filled with a graphene coating 7, the thickness of which is 80% to 90% of the micropore depth, that is, approximately 0.16 mm to 0.45 mm. The graphene coating 7 has excellent thermal conductivity and reflectivity, which can reflect heat from the external environment back, and at the same time, it can also promote air circulation through the structural design of the micropore array 6, thereby further improving the overall heat dissipation effect. This design enables the upper cover body 1 to effectively block the intrusion of external heat in high-temperature environments, and to quickly dissipate excess heat through the synergistic effect of the thermally conductive fiber bundles 5 and the graphene coating 7.

[0017] like Figure 1As shown, to ensure the sealing performance between the top cover body 1 and the battery pack housing, a sealing groove 8 is provided on the edge of the top cover body 1, and an elastic sealing strip 9 is embedded in the sealing groove 8. This design not only improves the sealing performance of the sealing strip 9, but also gives it good vibration resistance, enabling it to absorb some energy when the battery pack is subjected to vibration or impact, preventing seal failure caused by vibration. In addition, the elastic sealing strip 9 is made of silicone rubber or other materials with good elasticity and weather resistance to adapt to different usage environments.

[0018] During manufacturing, the top cover body 1 is formed using RTM (Resin-to-Mold) technology, which involves injecting resin into a mold and curing it under specific pressure and temperature. The honeycomb cavity 2 is directly formed onto the inner surface of the top cover body 1 using a mold design. Aerogel particles 3 are then filled into the cavity and fixed with an adhesive. The heat insulation layer 4 is integrally formed with the top cover body 1, and thermally conductive fiber bundles 5 are pre-embedded into the heat insulation layer 4 during the forming process. Finally, a nano-scale alumina heat insulation coating is coated onto its surface. The microporous array 6 is formed through laser drilling or machining, and the graphene coating 7 is filled into the micropores through spraying or impregnation. The entire manufacturing process is simple and efficient, ensuring a tight bond between components and achieving excellent overall performance.

[0019] In summary, this invention, by setting honeycomb cavities 2 and filling them with aerogel particles 3 within the RTM high-composite material top cover body 1, combined with the microporous array 6 and graphene coating 7 on the outer surface, forms a multi-level thermal insulation system that can significantly reduce the heat transfer rate, thereby effectively maintaining the temperature stability inside the battery pack. Simultaneously, the design combining an integrally molded thermal insulation layer 4 and thermally conductive fiber bundles 5 not only blocks external heat intrusion but also quickly dissipates excess heat generated by the battery module, preventing heat accumulation. Furthermore, the design of the elastic sealing strip 9 provides good vibration resistance and installation adaptability while ensuring sealing performance, effectively preventing the infiltration of external cold air or moisture, further enhancing the thermal insulation effect. The overall structure fully utilizes the lightweight characteristics of the RTM high-composite material, and by rationally arranging the position and size of the honeycomb cavities 2 and thermally conductive fiber bundles 5, the mechanical and thermal properties of the top cover body 1 are optimized, enabling it to maintain high structural strength and durability while meeting thermal insulation requirements.

[0020] Contents not described in detail in this specification are existing technologies known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A structure for improving the thermal insulation performance of a battery pack cover, comprising a cover body (1), characterized in that, The inner surface of the upper cover body (1) is provided with uniformly distributed honeycomb cavities (2), the honeycomb cavities (2) are filled with aerogel particles (3), the outer side of the honeycomb cavities (2) is provided with an integrally formed heat insulation layer (4), the heat insulation layer (4) is embedded with multiple heat-conducting fiber bundles (5), one end of the heat-conducting fiber bundle (5) extends to the inner surface of the upper cover body (1), and the other end penetrates the heat insulation layer (4) and extends to the outer surface of the upper cover body (1). The outer surface of the upper cover body (1) is provided with a plurality of micropore arrays (6), the micropore arrays (6) are filled with graphene coating (7).

2. The structure for improving the thermal insulation performance of the battery pack cover according to claim 1, characterized in that: The edge of the upper cover body (1) is provided with a sealing groove (8), and an elastic sealing strip (9) is embedded in the sealing groove (8).

3. The structure for improving the thermal insulation performance of the battery pack cover according to claim 1, characterized in that: The depth of the honeycomb cavity (2) is 30%-40% of the thickness of the upper cover body (1), and the spacing between adjacent honeycomb cavities (2) is 1.5 times the maximum diameter of the honeycomb cavity (2).

4. The structure for improving the thermal insulation performance of the battery pack cover according to claim 1, characterized in that: One end of the thermally conductive fiber bundle (5) extends to the inner surface of the upper cover body (1), and the other end of the thermally conductive fiber bundle (5) penetrates the heat insulation layer (4) and extends to the bottom of the microporous array (6). The outer surface of the thermally conductive fiber bundle (5) is coated with a nano-scale alumina heat insulation coating.

5. The structure for improving the thermal insulation performance of the battery pack cover according to claim 1, characterized in that: The micropore array (6) has a pore diameter of 0.2-0.5 mm and a pore spacing of 2-3 times the pore diameter. The graphene coating (7) has a thickness of 80%-90% of the micropore depth.

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